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/*
* Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines
import kotlinx.coroutines.selects.*
import kotlinx.coroutines.sync.*
import kotlin.test.*
class AtomicCancellationCommonTest : TestBase() {
@Test
fun testCancellableLaunch() = runTest {
expect(1)
val job = launch {
expectUnreached() // will get cancelled before start
}
expect(2)
job.cancel()
finish(3)
}
@Test
fun testAtomicLaunch() = runTest {
expect(1)
val job = launch(start = CoroutineStart.ATOMIC) {
finish(4) // will execute even after it was cancelled
}
expect(2)
job.cancel()
expect(3)
}
@Test
fun testDeferredAwaitCancellable() = runTest {
expect(1)
val deferred = async { // deferred, not yet complete
expect(4)
"OK"
}
assertEquals(false, deferred.isCompleted)
var job: Job? = null
launch { // will cancel job as soon as deferred completes
expect(5)
assertEquals(true, deferred.isCompleted)
job!!.cancel()
}
job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
try {
deferred.await() // suspends
expectUnreached() // will not execute -- cancelled while dispatched
} finally {
finish(7) // but will execute finally blocks
}
}
expect(3) // continues to execute when job suspends
yield() // to deferred & canceller
expect(6)
}
@Test
fun testJobJoinCancellable() = runTest {
expect(1)
val jobToJoin = launch { // not yet complete
expect(4)
}
assertEquals(false, jobToJoin.isCompleted)
var job: Job? = null
launch { // will cancel job as soon as jobToJoin completes
expect(5)
assertEquals(true, jobToJoin.isCompleted)
job!!.cancel()
}
job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
try {
jobToJoin.join() // suspends
expectUnreached() // will not execute -- cancelled while dispatched
} finally {
finish(7) // but will execute finally blocks
}
}
expect(3) // continues to execute when job suspends
yield() // to jobToJoin & canceller
expect(6)
}
@Test
fun testLockAtomicCancel() = runTest {
expect(1)
val mutex = Mutex(true) // locked mutex
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
mutex.lock() // suspends
expect(4) // should execute despite cancellation
}
expect(3)
mutex.unlock() // unlock mutex first
job.cancel() // cancel the job next
yield() // now yield
finish(5)
}
@Test
fun testSelectLockAtomicCancel() = runTest {
expect(1)
val mutex = Mutex(true) // locked mutex
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
val result = select<String> { // suspends
mutex.onLock {
expect(4)
"OK"
}
}
assertEquals("OK", result)
expect(5) // should execute despite cancellation
}
expect(3)
mutex.unlock() // unlock mutex first
job.cancel() // cancel the job next
yield() // now yield
finish(6)
}
}
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